Restructuring and Other Costs (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Balance, beginning of period	$ 28	$ 70
Accruals/provisions	20	18
Payments/ write-offs	(27)	(22)
Balance, end of period	21	66
Severance Benefit and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning of period	22	70
Accruals/provisions	3	13
Payments/ write-offs	(10)	(19)
Balance, end of period	15	64
Professional Fees [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning of period	0	0
Accruals/provisions	1	5
Payments/ write-offs	(1)	(3)
Balance, end of period	0	2
Asset Impairment Charges [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning of period	0	0
Accruals/provisions	16	0
Payments/ write-offs	(16)	0
Balance, end of period	0	0
Other Contract Termination Charges [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning of period	6	0
Accruals/provisions	0	0
Payments/ write-offs	0	0
Balance, end of period	$ 6	$ 0